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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Tue, 4 Jun 2019 14:23:01 +0100 Received: from d06av23.portsmouth.uk.ibm.com (d06av23.portsmouth.uk.ibm.com [9.149.105.59]) by b06cxnps3075.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id x54DMwfd52559956 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 4 Jun 2019 13:22:58 GMT Received: from d06av23.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 7751CA4059; Tue, 4 Jun 2019 13:22:58 +0000 (GMT) Received: from d06av23.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id C92A1A4051; Tue, 4 Jun 2019 13:22:57 +0000 (GMT) Received: from oc2783563651 (unknown [9.152.224.145]) by d06av23.portsmouth.uk.ibm.com (Postfix) with ESMTP; Tue, 4 Jun 2019 13:22:57 +0000 (GMT) Date: Tue, 4 Jun 2019 15:22:56 +0200 From: Halil Pasic To: Cornelia Huck Cc: Michael Mueller , KVM Mailing List , Linux-S390 Mailing List , Sebastian Ott , Heiko Carstens , virtualization@lists.linux-foundation.org, "Michael S . Tsirkin" , Christoph Hellwig , Thomas Huth , Christian Borntraeger , Viktor Mihajlovski , Vasily Gorbik , Janosch Frank , Claudio Imbrenda , Farhan Ali , Eric Farman , Pierre Morel Subject: Re: [PATCH v3 4/8] s390/airq: use DMA memory for adapter interrupts In-Reply-To: <20190603172740.1023e078.cohuck@redhat.com> References: <20190529122657.166148-1-mimu@linux.ibm.com> <20190529122657.166148-5-mimu@linux.ibm.com> <20190603172740.1023e078.cohuck@redhat.com> Organization: IBM X-Mailer: Claws Mail 3.11.1 (GTK+ 2.24.31; x86_64-redhat-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 x-cbid: 19060413-4275-0000-0000-0000033C8EB0 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 19060413-4276-0000-0000-0000384C9DAA Message-Id: <20190604152256.158d688c.pasic@linux.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2019-06-04_09:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1906040090 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org On Mon, 3 Jun 2019 17:27:40 +0200 Cornelia Huck wrote: > On Wed, 29 May 2019 14:26:53 +0200 > Michael Mueller wrote: > > > From: Halil Pasic > > > > Protected virtualization guests have to use shared pages for airq > > notifier bit vectors, because hypervisor needs to write these bits. > > > > Let us make sure we allocate DMA memory for the notifier bit vectors by > > replacing the kmem_cache with a dma_cache and kalloc() with > > cio_dma_zalloc(). > > > > Signed-off-by: Halil Pasic > > Reviewed-by: Sebastian Ott > > Signed-off-by: Michael Mueller > > --- > > arch/s390/include/asm/airq.h | 2 ++ > > drivers/s390/cio/airq.c | 32 ++++++++++++++++++++------------ > > drivers/s390/cio/cio.h | 2 ++ > > drivers/s390/cio/css.c | 1 + > > 4 files changed, 25 insertions(+), 12 deletions(-) > > Apologies if that already has been answered (and I missed it in my mail > pile...), but two things had come to my mind previously: > > - CHSC... does anything need to be done there? Last time I asked: > "Anyway, css_bus_init() uses some chscs > early (before cio_dma_pool_init), so we could not use the pools > there, even if we wanted to. Do chsc commands either work, or else > fail benignly on a protected virt guest?" Protected virt won't support all CHSC. The supported ones won't requre use of shared memory. So we are fine. > - PCI indicators... does this interact with any dma configuration on > the pci device? (I know pci is not supported yet, and I don't really > expect any problems.) > It does but, I'm pretty confident we don't have a problem with PCI. IMHO Sebastian is the guy who needs to be paranoid about this, and he r-b-ed the respective patches. Regards, Halil